论文部分内容阅读
在调查分析长江上游现有坡耕地植物篱的配置方式、生长状况和室内分析植物篱-坡耕地系统中土壤养分含量和颗粒组成的基础上,对3种坡耕地-植物篱系统中土壤养分含量及其分布特征进行了研究,结果表明:在坡耕地-植物篱系统中,植物篱能显著改善和提高植物篱带内表层土壤的养分含量,不同植物篱带内土壤有机质、全氮、水解氮、全磷、速效磷、全钾、速效钾平均质量分数比带间坡耕地土壤分别提高了59.1%、83.5%、56.2%、83.3%、149.6%、14.0%、153.1%,植物篱带内土壤阳离子交换量比带间坡耕地土壤提高了21.6%。植物篱带内比带间坡耕地土壤沙粒质量分数减小了9.4%,粘粒质量分数增加了21.6%,在植物篱系统中土壤粘粒质量分数与土壤养分含量在3种植物篱系统内表现出一致的规律性,自篱间坡耕地至植物篱带呈增加的趋势,至植物篱带下土壤粘粒和土壤养分含量减小。
On the basis of investigation and analysis of the allocation patterns and growing status of existing hedgerows in the upper reaches of the Yangtze River and indoor analysis of soil nutrient content and particle composition in the hedgerow-slope cultivated land system, the soil nutrient contents The results showed that in the slope farmland-hedgerow system, the hedgerows could significantly improve and enhance the nutrient content of the surface soil in the hedgerows. The contents of soil organic matter, total nitrogen, hydrolyzed nitrogen , Total phosphorus, available phosphorus, total potassium and available potassium increased by 59.1%, 83.5%, 56.2%, 83.3%, 149.6%, 14.0% and 153.1% The cation exchange capacity increased by 21.6% compared with sloping farmland in the strip. In the hedgerows, the mass fraction of soil sand decreased by 9.4% and the clay mass fraction increased by 21.6% compared with that in the strip-slope farmland. In the hedgerow system, the soil clay content and the soil nutrient content were within 3 hedgerow systems Showed consistent regularity. The trend of hedgerows to hedgerows increased from the hedgerows until the content of soil clay and soil nutrients under the hedgerows decreased.